I feel like if you were to draw more abstract stuff it would look much better, But if you really want to continue on the path then I suggest you take an art class or Do more self practice, You have a lot of potential but you definitely need more practice.
Check out children drawing books from your local library. (I'm middle-aged and that's what I've been doing off and on for the past year.) They provide excellent advice for shading and other techniques. Then the sketches are not only helpful for practice but fun.
Your are is good but with a bit more practice, you can do even better. If you want to practice i recommend taking a look at 's stuff ^^ or you could study human anatomy a bit more, get the proportions right, and your art will be much better :3
i've seen your art you just need lots and lots and lots of practices beside practices, you should check out other people's arts and read/watch cartoons, anime or comic, manga not just watching normally, try to pause at some scenes that have to do with complicated angles, notice every single part on the design and art reading comic/ manga slowly not only help you with your details but also understanding the plot